Auckland SST: A 19 °C edge, on one pass only

What the passes show

Passes read

17

The edge

19 °C

Step across it

0.8 °C

72-hour composite

90% of the water clear

17 passes over the water, in order, clouds left as holes (NOAA-20 VIIRS, MetOp-B AVHRR, MetOp-C AVHRR, NOAA-21 VIIRS).

One pass (MetOp-B AVHRR, Thu 9:10 am) saw a 19 °C edge with a 0.8 °C step; cloud hid it on the other 16. One pass is a lead, not a trend.

At 50 m: 17.4 °C under the warm side, 16.4 °C under the cool side; the break reaches 50 m (1.1 °C across) · 1.5 °C at 100 m. Sea surface 8 cm higher on the warm side, 0.3 kn geostrophic current on the line — a current edge.

Nearest named ground: the Needles, Great Barrier, 34 km from the break.

Every number is from the satellite passes. Where the water says to look — not where the fish are.

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A pass, a break, a composite

A pass is one satellite crossing the water once: it sees what the cloud lets it see and leaves the rest as holes. A break is a line the temperature steps across, and it only counts when more than one pass saw it. The composite fills the holes from the other passes of the same 72 hours.

How to read an SST passWhy fish sit on a breakComposite or single pass

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Satellite SST: NOAA/STAR ACSPO L3U via NASA PO.DAAC (subskin temperature)

Subsurface: Copernicus Marine (model)

Sea height: Copernicus Marine DUACS altimetry

Coastline: Made with Natural Earth

Every data source and licence